Hi Rawand,
I totally understand how you felt during the exam. I too was a little panic when I read the first 50 or so questions.
Now that you have seen the actual exam, you know that the question style is a bit different than Prepcast, which is normal because it's a different team that writes the exam question. I would recommend doing a variety of different exam simulations (I did Rita v9, Lehmann, etc). That would acclimatize you for various types of question styles.
I agree skipping a question if you finding it difficult to understand, or you couldn't decide which is the right answer. I would also categorize these reasons, and mark them on your scrap paper. So that when you go back to these questions you'll know exactly where to resume.
When you feel you are ready, book the exam. Try not to study 24-48 hours before the exam date, do something you like (I went for a motorcycle ride and massage) instead. On the day of exam, exercise in the morning, get your oxygen level up; Also I usually have a chat with people in the exam waiting room, that helps me to relieve stress as well. During the exam, remember to breath, pace yourself, close your eyes for a few second if you are tired, take short breaks to rehydrate, etc.
Good Luck!